Best Way to Create Google Product Carousel Ad

TL;DR: Google carousel ads run inside Demand Gen campaigns. Build them manually with 2-10 images and card-level copy, or automate them through a Google Merchant Center product feed. Both paths need strong, on-brand visuals.

What Are Google Product Carousel Ads?

Carousel ads let shoppers swipe through multiple images in a single ad unit. They appear across YouTube, Gmail, Google Discover, and the Display Network. Per Google's Ads Help Center, carousel ads are a Demand Gen format, not a traditional Display or Shopping format. That distinction matters. It changes where you build them, how you target, and how Google serves them.

Two Ways to Create Carousel Ads with Your Products

Google gives you two paths.

Manual carousel ads. You upload 2-10 images yourself. You write every headline and URL. Full creative control. Best for brands with existing product photography or a clear visual story to tell.

Product feed carousels. You connect a Google Merchant Center feed. Google auto-pulls product images and renders them in carousel format using machine learning. Best for ecommerce stores with large catalogs and limited design resources.

The right path depends on your catalog size and how much control you want over each card.

Manual Carousel Ads: Step-by-Step Setup

Manual carousels give you complete control over visuals and messaging. Here is how to build one.

Create a Demand Gen campaign

Open Google Ads and click New campaign. Choose Demand Gen as the campaign type. Set your budget, bidding strategy, and audience targeting before moving on. Carousel ads live at the ad group level, so finish campaign-level settings first.

Navigate to create a new ad

Inside your Demand Gen campaign, open the ad group. Click New ad. You will see the ad creation screen with carousel listed as one of the available formats.

Select carousel ad type

Choose Carousel ad from the format options. A card-by-card editor loads. Each card is one image in the swipe sequence.

Upload and arrange 2-10 images

Upload between 2 and 10 images. Per Google Ads documentation, all images in a single carousel must share the same aspect ratio. Horizontal (1.91:1), square (1:1), or vertical (4:5 or 9:16) are all supported. Google recommends uploading three images per aspect ratio to maximize placement coverage across placements. Maximum file size is 5MB per image. Arrange the cards deliberately. Lead with your strongest visual.

Add carousel-level and card-level copy

At the carousel level, write a headline (40 characters max) and a description (90 characters max). These apply to the full ad unit.

At the card level, each image can carry its own headline. Use this to build a story across the swipe sequence. Card one introduces the product. Card two highlights a key feature. Card three drives the conversion. Each card headline stays within the 40-character limit.

Set individual URLs per card (optional)

Each card can point to a different final URL. This matters for multi-product carousels. If card one shows a jacket and card two shows boots, send each user to the matching product page. Do not funnel all swipes to a generic homepage.

Product Feed Carousel Ads: The Automated Path

If you run an ecommerce store, the feed-based path scales faster than building cards manually.

Link your Google Merchant Center feed

Set up a Google Merchant Center account and upload your product catalog. Google recommends square 1:1 product images for feed-based ads. Review image quality inside Merchant Center before linking. Blurry or cropped images will appear in ads exactly as they are.

Create a Demand Gen campaign with product feed enabled

Create a new Demand Gen campaign and toggle on Product feed in campaign settings. Connect your Merchant Center account. Per Google's documentation, 4 products is the minimum, but 50 or more gives the algorithm enough variety to optimize well.

Let Google auto-render products in carousel format

Once the feed is connected, Google selects products and renders them in carousel format automatically. Machine learning matches products to users based on browsing behavior. You do not build individual cards. The trade-off is less creative control. The benefit is scale.

One important note from Google's Ads Help Center. you cannot use a Merchant Center product feed with a manual carousel ad. They are two separate ad types. You can run both in separate ad groups within the same campaign.

Image Specifications for Carousel Ads

Per Google Ads documentation, these are the specs that matter:

| Aspect Ratio | Recommended Size | Minimum Size |

|---|---|---|

| Horizontal 1.91:1 | 1200x628px | 600x314px |

| Square 1:1 | 1200x1200px | 300x300px |

| Vertical 4:5 | 960x1200px | 480x600px |

Max file size is 5MB per image. All images in one carousel must share the same aspect ratio. Google recommends testing horizontal and square formats to find which drives better results for your brand.

Design Best Practices for Carousel Cards

Strong images drive swipes. Weak images waste budget.

Lead with your best. The first card is the hook. If it does not stop the scroll, users never see the rest.

Keep visuals consistent. Same lighting, same color palette, same font style across every card. Inconsistent cards look like random images stitched together. That breaks trust fast.

One message per card. One product. One benefit. One clear point. Busy cards confuse users and reduce swipe-through rates.

Match copy to image. If card two shows a red jacket, the card headline should reference that jacket. Mismatched copy and visuals signal a low-effort ad.

Plan the arc. The swipe sequence is a short story. Introduce, detail, convert. Know the ending before you upload the first image.

Speed Up Carousel Creation with AI-Generated Creatives

The hardest part of manual carousels is producing 2-10 high-quality, brand-consistent images. Stock photos rarely look cohesive across cards. Custom photography takes days.

Coinis Image Ads workflow generates carousel-ready product images from a product URL in seconds. Paste your URL, choose your format, and get a full set of visuals built around your actual product. No designer needed.

Brand Profile learns your brand's colors, tone, and messaging. Every image Coinis generates stays on-brand automatically. That consistency across cards is exactly what Google's best practices call for.

Download the images from Coinis. Upload them directly to your Demand Gen campaign. Carousel creation goes from hours to minutes.

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